<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>冒泡排序</title>
</head>

<body>
<?php
  $arr=array('10','12','9','7','20');
   for($i=0,$len=count($arr);$i<$len;$i++){
       for($j=0;$j<$len-1;$j++){
         if($aa[$j]>$arr[$j+1]){
           $temp=$arr[$j];
           $arr[$j]=$arr[$j+1];
           $arr[$j+1]=$temp;
       }
       }
   }
   var_dump($arr);
?>

</body>
</html>